US6291765B1 - Electromagnetically shielded housing having metal parts snap-connected via a spring contact strip - Google Patents

Electromagnetically shielded housing having metal parts snap-connected via a spring contact strip Download PDF

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Publication number
US6291765B1
US6291765B1 US09/152,309 US15230998A US6291765B1 US 6291765 B1 US6291765 B1 US 6291765B1 US 15230998 A US15230998 A US 15230998A US 6291765 B1 US6291765 B1 US 6291765B1
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US
United States
Prior art keywords
housing
housing part
subrack
contact strip
spring contact
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US09/152,309
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English (en)
Inventor
Siegfried Kurrer
Werner Körber
Ernst Billenstein
Kurt-Michael Schaffer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rittal Electronic Systems GmbH and Co KG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Assigned to SIEMENS AKTIENGESELLSCHAFT reassignment SIEMENS AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BILLENSTEIN, ERNST, KORBER, WERNER, KURRER, SIEGFRIED, SCHAFFER, KURT-MICHAEL
Assigned to RITTAL ELECTRONIC SYSTEMS GMBH & CO. KG reassignment RITTAL ELECTRONIC SYSTEMS GMBH & CO. KG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SIEMENS AKTIENGESELLSCHAFT
Application granted granted Critical
Publication of US6291765B1 publication Critical patent/US6291765B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0007—Casings
    • H05K9/0015—Gaskets or seals
    • H05K9/0016—Gaskets or seals having a spring contact

Definitions

  • the invention relates to new and useful improvements in electomagnetically shielded housings for electric circuits.
  • the circuits must be shielded against electromagnetic waves.
  • the housing surrounding the electric circuit must comprise mostly metal parts.
  • the shielding prevents electromagnetic waves from both entering and leaving the housing.
  • This requires continuous electric connections, in particular contact spring elements, between the metal housing parts. These connections must have as few gaps as possible, in correspondence with the range of applicable electromagnetic frequencies.
  • German Utility Model G 92 09 519.4 discloses an RF-proof subrack having a cover with angled edge strips along the lateral edges of the cover. With the cover mounted, these edge strips engage in longitudinal grooves of two upper module rails of the subtrack. Inserted into each of the longitudinal grooves in this arrangement is a strip-shaped spring element. With the cover mounted and screwed against the upper module rails by means of fastening screws, this strip-shaped spring element produces an electric contact between the module rails and the cover.
  • a disadvantage is the use of separate elements for the electrical connection and mechanical connection between the module rails and cover, which complicates the mounting of the cover.
  • the electrical connection is produced by the angled-off edge strips of the cover, which engage in the longitudinal grooves
  • the mechanical connection is provided by means of screws.
  • German Patent DE 39 28 461 C2 discloses an electromagnetically shielded subrack which has metal cover plates with edges that are angled off on all four sides.
  • Profiled rails with grooves are fitted in the subrack and have a strip-shaped projection on one edge.
  • V-springs are inserted into these grooves and extend along virtually the entire groove length.
  • the angled-off edges of one cover plate, which extend in the width direction of the subrack, are pressed into the grooves during assembly.
  • the angled-off edges press against the limbs of the springs and generate an electrical connection between the cover plate and profiled rails.
  • the angled-off edges on the insides of the side walls rest on those ends of the cover plates which extend in the direction of the side walls.
  • the side-walls can be screwed mechanically to the edges of the cover plates through holes drilled in the side walls at the level of the edges, and can be compressed to form an electrical connection.
  • a problem in assembling the subrack is caused by a counterpressure exerted by the V-springs on the angled-off edges of the cover plate.
  • these edge regions of the cover plate bend upward, and must additionally be pressed onto the profiled rails for the purpose of assembly, causing extra work. It is therefore impossible to avoid subsequently screwing the cover plate to the side walls.
  • German Utility Model DE 94 02 714 U1 discloses a subrack having shaped strips and having top plates.
  • the top plates are fastened via rivet joints and catch springs, whereby the catch springs latch on the shaped strips.
  • sealing elements in the form of foam plastic seals wrapped with metal foil are additionally fastened to the shaped strips.
  • a further subrack having module rails and having cover plates is described in German Utility Model DE 296 18 631 U1.
  • a fastening groove into which a spring element is inserted in a clamping fashion, is recessed in the module rails.
  • An angled-off edge strip of the cover plate extends into the spring element. Contact is made with the cover plate via inwardly spread-out spring tongues of the spring elements.
  • a further object of the invention is to provide a housing, in particular a subrack, exhibiting superior electromagnetic shielding.
  • an electromagnetically shielded housing in particular a subrack, having metal parts and at least one spring contact strip, which is shaped and joined to a first metal housing part in such a way that the same can simultaneously make contact with and be snap-connected to a second metal housing part.
  • the spring contact strip includes a constricted region, by which the contact strip is clamped to the first housing part, and a contact bow, which is shaped so that the contact bow latches the first housing part to the second housing part.
  • housing in accordance with the invention is the simplified assembly of the housing parts, for example the cover plates of a subrack.
  • the snap connection of two housing parts effected by means of the spring contact strip requires no additional compression.
  • the housing parts to be screwed together. If, on the other hand, a screwed joint is nevertheless desired, the screws can be introduced into the housing parts, which, in their final position, will be fixed without producing internal stresses.
  • the distal edges of the cover plates are not bent back again from the spring groove of a transverse rail after being pressed in, but rather are firmly locked therein. This permits optimum electromagnetic shielding even in the transition region between the housing parts.
  • FIG. 1 shows, by way of example, a cross-section of a housing according to the invention and having a first housing part with a pushed-on spring contact strip, and a second housing part;
  • FIG. 2 shows et cross-section of the housing of FIG. 1, in which the first housing part makes contact with and is snap-connected to the second housing part by means of the pushed-on spring contact strip;
  • FIG. 3 is a perspective and partly exploded view of the front corner region of a subrack, in which a subrack shielding plate in accordance with the invention is shown ready to make contact with and be snap-connected to a front transverse rail of the subtrack; and
  • FIG. 4 is a cross-sectional view of the housing represented in FIG. 3, with a first housing part in accordance with the invention placed in contact with and snap-connected to a second housing part by means of a spring contact strip, and with the first housing part additionally supported in the region of the side edges by support elements.
  • FIG. 1 represents, by way of example, a first metal housing part BE and a second metal housing part QV of an electromagnetically shielded housing in accordance with the invention.
  • the first housing part BE is not yet mounted on the second housing part QV this represents the state before assembly of the two housing parts BE, QV.
  • the first housing part BE is provided with at least one spring contact strip FE.
  • the joint between the first housing part BE and the spring contact strip FE is based principally on a snap connection, i.e., a press-fit or clamp connection.
  • the first housing part BE has a preferably angled-off edge region KE to which the spring contact strip FE is attached.
  • This angled-off portion of the edge region KE represents a contact limb, in particular, and is produced, for example, by bending the edge of the first housing part BE at a location outside of a non-edge region KN.
  • the first housing part BE generally takes the form of a metal sheet.
  • the spring contact strip FE has a constricted region FV by means of which the spring contact strip FE is press-connected to the first housing part BE.
  • the constricted region FV is configured in the base region of the spring contact strip FE such that the spring can be pressed onto the edge of the first housing part BE to form a connection.
  • FIG. 2 represents the electromagnetically shielded housing of FIG. 1, again in cross-section but assembled.
  • the first housing part BE simultaneously makes contact with and locks onto the second metal housing part QV via the spring contact strip FE.
  • This design for the connection facilitates the assembly and prevents undesired separation of the housing parts.
  • the spring contact strip FE produces an electrical connection between the first and the second housing parts BE and QV, thus shielding the housing electromagnetically.
  • the spring contact strip FE has a contact bow FK which extends in such a way that it bears resiliently against the second housing part QV and makes contact with and is locked to the second housing part QV.
  • the contact bow FK locks behind a preferably strip-shaped projection QK of the second housing part QV.
  • the spring contact strip FE includes a ridge portion FR and a flank portion FF.
  • the ridge portion FR cradles the distal edge of the angled-off edge region KE of the first metal housing part BE.
  • the flank portion FF extends up and rests against an inner surface of the angled-off edge region KE, such that the angled-off edge region KE is gripped between the constricted region FV and the flank portion FF.
  • a strip-shaped bearing limb QS of the second housing part QV can be used to support the first housing part BE in the region of the angled-off edge region KE.
  • the electromagnetically shielded housing is designed as a subrack.
  • a shielding plate BE 1 in particular a subrack shielding plate such as a laminate screening plate, can be used as the first housing part, and a transverse rail QV 1 as the second housing part.
  • the width of the angled-off edge region KE 1 of the subrack shielding plate BE 1 is then matched to the transverse rail QV 1 to which the angled-off edge region KE 1 locks by means of the spring contact strip FE 1 .
  • FIG. 3 Shows the front corner region of such a subrack.
  • the subrack has at least one upper metal subrack shielding plate BE 1 having an angled-off edge region KE 1 and at least one metal front transverse rail QV 1 .
  • the spring contact strip FE 1 pressed onto the subrack shielding plate BE 1 is represented in partial cutaway in the exemplary, perspective representation of FIG. 3 .
  • the subrack shielding plate BE 1 is not yet located in the position where it is locked with the front transverse rail QV 1 .
  • the exemplary embodiment in FIG. 3 additionally includes a separate, inwardly situated supporting element BK.
  • This supporting element BK joins the subrack shielding plate BE 1 and the side panel sheet BS in the edge region thereof, which resembles a corner joint. This further ensures electromagnetic shielding in the interior of the subrack with a minimum of gaps.
  • the side edge KS of the subrack shielding plate BE 1 that rests on the supporting element or elements BK, unlike the angled-off edge region KE 1 is preferably not angled off. Thus, no overlapping occurs between the subrack shielding plate BE 1 and the side panel sheet BS in this joint.
  • the corresponding side edges thereof now abut one another as a corner joint and can be joined to one or more supporting elements BK.
  • This provides variability with respect to the positioning of supporting elements BK, in particular in the edge region.
  • the supporting element or elements BK can also be used for further corner joints in the subrack, for example between a possible further, lower subrack shielding plate and further side panel sheets or front and/or rear panels.
  • a screw connection by means of countersunk screws SE has proved to be advantageous for joining the subrack shielding plate BE 1 , the side panel sheet BS and the supporting element BK.
  • the subrack has a lateral corner shape EP which is joined to a side panel sheet BS of the subrack and, at least in the upper corner region, to a front transverse rail QV 1 .
  • the subrack shielding plate BE 1 has an array of ventilation holes RE for ventilation of modules inserted into the subrack.
  • the subrack can have a lower subrack shielding plate BE 1 , not represented in FIG. 3, further transverse rails QV 1 and a further side panel sheet BS or front and/or rear panels.
  • the subrack shielding plate BE 1 has a row of fastening holes LE, at least in the side region of the edge or edges which are situated closest to the side panel sheet or sheets BS.
  • FIG. 4 represents a cross-section of the corner region of the subrack illustrated in FIG. 3.
  • a first housing part BE 1 makes contact with and is snap-connected to a second housing part QV 1 .
  • a spring contact strip FE 1 which is joined to the angled-off edge region KE 1 of the first housing part BE 1 locks behind a strip-shaped projection QK 1 of the second housing part QV 1 .
  • the first housing part BE 1 is supported in the region of those side edges that are not angled off, on supporting elements BK.
  • the invention is particularly advantageous as an electromagnetically shielded housing for subracks.
  • the simplified assembly of the subrack shielding plates BE 1 is particularly advantageous.
  • the stress-free snap connection provided by the spring contact strip FE 1 between the subrack shielding plate BE 1 and the transverse rail QV 1 requires no additional fixing or compression.
  • Additional screwing of the subrack shielding plate BE 1 to the side panel sheets BS need be performed only if increased stability is required. This can be done, for example, by screwing together the elements by means of advantageous supporting elements BK or by means of further bends, not represented in FIG. 3, of the lateral edge region of the subrack shielding plate BE 1 .
  • the superior electromagnetic shielding resulting from the snap connection in the transition region between the subrack shielding plates BE 1 and the transverse rails QV 1 is particularly advantageous.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)
US09/152,309 1996-03-12 1998-09-14 Electromagnetically shielded housing having metal parts snap-connected via a spring contact strip Expired - Lifetime US6291765B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE29604599U DE29604599U1 (de) 1996-03-12 1996-03-12 Elektromagnetisch abgeschirmtes Gehäuse mit über eine Kontaktfederleiste verrastbaren metallischen Gehäuseteilen
PCT/DE1997/000369 WO1997034456A1 (de) 1996-03-12 1997-02-28 Elektromagnetisch abgeschirmtes gehäuse mit über eine kontaktfederleiste verrastbaren metallischen gehäuseteilen
DE29604599U 1999-03-12

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1997/000369 Continuation WO1997034456A1 (de) 1996-03-12 1997-02-28 Elektromagnetisch abgeschirmtes gehäuse mit über eine kontaktfederleiste verrastbaren metallischen gehäuseteilen

Publications (1)

Publication Number Publication Date
US6291765B1 true US6291765B1 (en) 2001-09-18

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ID=8020950

Family Applications (1)

Application Number Title Priority Date Filing Date
US09/152,309 Expired - Lifetime US6291765B1 (en) 1996-03-12 1998-09-14 Electromagnetically shielded housing having metal parts snap-connected via a spring contact strip

Country Status (13)

Country Link
US (1) US6291765B1 (cs)
EP (1) EP0886997B1 (cs)
JP (1) JP3805380B2 (cs)
KR (1) KR19990087698A (cs)
CN (1) CN1115092C (cs)
AT (1) ATE185467T1 (cs)
CA (1) CA2248690A1 (cs)
CZ (1) CZ285698A3 (cs)
DE (2) DE29604599U1 (cs)
ES (1) ES2138455T3 (cs)
HU (1) HUP9901785A3 (cs)
SK (1) SK123498A3 (cs)
WO (1) WO1997034456A1 (cs)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6509523B2 (en) * 2000-03-15 2003-01-21 Rittal Gmbh & Co. Kg Switchgear cabinet
RU2456783C1 (ru) * 2011-03-30 2012-07-20 Открытое акционерное общество "Государственный Рязанский приборный завод" (ОАО "ГРПЗ") Экранированный корпус прибора с охлаждением
CN111741667A (zh) * 2020-07-30 2020-10-02 北京中超伟业信息安全技术股份有限公司 一种智能电磁屏蔽机柜
RU236947U1 (ru) * 2025-05-12 2025-09-01 Федеральное государственное бюджетное учреждение науки Дагестанский федеральный исследовательский центр Российской академии наук Универсальная быстросъемная охлаждаемая платформа для установки тепловыделяющих функциональных узлов в неохлаждаемую вакуумную камеру

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106998645A (zh) * 2016-01-25 2017-08-01 上海智远弘业机器人有限公司 一种用于仓储物流的rfid检测隔离箱
DE102023004615A1 (de) 2023-07-04 2025-01-09 Bernd Hillerich Faltbare TEM-Zelle

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3523770A1 (de) 1985-07-03 1987-01-08 Bosch Gmbh Robert Hochfrequenzdichtes gehaeuse
DE8714497U1 (de) 1987-10-30 1987-12-10 Siemens AG, 1000 Berlin und 8000 München Etagenschirmblech für einen Baugruppenträger
DE3928461A1 (de) 1989-08-29 1991-03-07 Licentia Gmbh Baugruppentraeger
US5029254A (en) * 1990-03-23 1991-07-02 Instrument Specialties Company, Inc. Clip mounted electromagnetic shielding device
DE9209519U1 (de) 1992-07-16 1992-08-27 Schroff Gmbh, 7541 Straubenhardt HF-dichter Baugruppenträger
US5233507A (en) * 1991-04-04 1993-08-03 Schroff Gmbh Modular unit for insertion into hf-tight housings for electronic equipment
US5250751A (en) * 1991-07-17 1993-10-05 Kitagawa Industries Co., Ltd. Electromagnetic shielding gasket
DE9402714U1 (de) 1993-08-30 1994-04-14 Elma Electronic Ag, Wetzikon Baugruppenträger mit Profilleisten und mit Deckplatten
DE29618631U1 (de) 1996-10-25 1996-12-12 Schroff Gmbh, 75334 Straubenhardt Baugruppenträger
DE29618628U1 (de) 1996-10-25 1996-12-12 Schroff Gmbh, 75334 Straubenhardt Abgeschirmter Baugruppenträger

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3523770A1 (de) 1985-07-03 1987-01-08 Bosch Gmbh Robert Hochfrequenzdichtes gehaeuse
DE8714497U1 (de) 1987-10-30 1987-12-10 Siemens AG, 1000 Berlin und 8000 München Etagenschirmblech für einen Baugruppenträger
DE3928461A1 (de) 1989-08-29 1991-03-07 Licentia Gmbh Baugruppentraeger
US5029254A (en) * 1990-03-23 1991-07-02 Instrument Specialties Company, Inc. Clip mounted electromagnetic shielding device
US5233507A (en) * 1991-04-04 1993-08-03 Schroff Gmbh Modular unit for insertion into hf-tight housings for electronic equipment
US5250751A (en) * 1991-07-17 1993-10-05 Kitagawa Industries Co., Ltd. Electromagnetic shielding gasket
DE9209519U1 (de) 1992-07-16 1992-08-27 Schroff Gmbh, 7541 Straubenhardt HF-dichter Baugruppenträger
DE9402714U1 (de) 1993-08-30 1994-04-14 Elma Electronic Ag, Wetzikon Baugruppenträger mit Profilleisten und mit Deckplatten
DE29618631U1 (de) 1996-10-25 1996-12-12 Schroff Gmbh, 75334 Straubenhardt Baugruppenträger
DE29618628U1 (de) 1996-10-25 1996-12-12 Schroff Gmbh, 75334 Straubenhardt Abgeschirmter Baugruppenträger

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6509523B2 (en) * 2000-03-15 2003-01-21 Rittal Gmbh & Co. Kg Switchgear cabinet
RU2456783C1 (ru) * 2011-03-30 2012-07-20 Открытое акционерное общество "Государственный Рязанский приборный завод" (ОАО "ГРПЗ") Экранированный корпус прибора с охлаждением
CN111741667A (zh) * 2020-07-30 2020-10-02 北京中超伟业信息安全技术股份有限公司 一种智能电磁屏蔽机柜
CN111741667B (zh) * 2020-07-30 2020-12-18 北京中超伟业信息安全技术股份有限公司 一种智能电磁屏蔽机柜
RU236947U1 (ru) * 2025-05-12 2025-09-01 Федеральное государственное бюджетное учреждение науки Дагестанский федеральный исследовательский центр Российской академии наук Универсальная быстросъемная охлаждаемая платформа для установки тепловыделяющих функциональных узлов в неохлаждаемую вакуумную камеру

Also Published As

Publication number Publication date
ES2138455T3 (es) 2000-01-01
JP2000506314A (ja) 2000-05-23
CZ285698A3 (cs) 1999-01-13
EP0886997B1 (de) 1999-10-06
CA2248690A1 (en) 1997-09-18
HUP9901785A3 (en) 2000-01-28
ATE185467T1 (de) 1999-10-15
CN1115092C (zh) 2003-07-16
EP0886997A1 (de) 1998-12-30
JP3805380B2 (ja) 2006-08-02
SK123498A3 (en) 1999-03-12
WO1997034456A1 (de) 1997-09-18
DE59700533D1 (de) 1999-11-11
HUP9901785A2 (hu) 1999-09-28
KR19990087698A (ko) 1999-12-27
DE29604599U1 (de) 1997-04-10
CN1206548A (zh) 1999-01-27

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